Transcript Prokaryotes PPT

DE Science Middle School
5-Minute Prep for
Organisms
Diversity of Life
Prokaryotes
Prokaryotes—Key Ideas
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Prokaryotes are individual microscopic organisms that
contain no nucleus and reproduce asexually.
Bacteria are the most commonly known form of
prokaryote.
The vast majority of bacteria are not harmful to
humans.
Prokaryotes—Prior Knowledge
• Students may have looked at bacterial cells under a
microscope. Prokaryotic cells, while simple, provide for
many different life forms, most bacteria.
• Before there were cells, there were chemical reactions.
Demonstrate some basic chemical reactions and then
ask, “What is the advantage of these occurring inside a
membrane?”
• Only bacteria have prokaryotic cells. What do students
think a bacteria is, and what does it look like?
Prokaryotes—Common Misconceptions
• DNA is always present inside a nucleus.
– Reality: DNA in prokaryotic organisms is able to
replicate and divide without a nucleus.
• Prokaryotes do not have organelles like other cells.
– Reality: They do have organelles, just not as many
are found in complex eukaryotic cells.
Prokaryotes—Using DE Science Content
Use the PowerPoint version of this presentation for
hyperlinks to these resources, or you can get to them
through the browser or search feature.
• Reading Passage: Prokaryotes and Eukaryotes
• Interactive Video: Life on the Edge
• Video: Form and Function: Bacteria Are the Simplest
Organisms
Prokaryotes—Instructional Ideas
• The Reading Passage Prokaryotes and Eukaryotes is a
clearly written, brief, illustrated PDF that introduces
differences and similarities between the two cell types.
• The Interactive Video Life on the Edge lets students
visualize different types of prokaryotes and observe
where they live.
• The Video Form and Function: Bacteria Are the Simplest
Organisms is a good video to use to introduce students
to the world of bacteria, which are the smallest, simplest
organisms. They consist of single cells with no nucleus.
State Standards
If you wish to review your state standards regarding
Prokaryotes, click here to get to the curriculum standards
search feature of DES.
http://search.discoveryeducation.com/CurriculumStandar
dLookup.cfm
You can click on any standard to see what resources are
available for you to use.